They follow the same naming conventions as Doman Hyur (Edo-era Japanese names), so one can only imagine that a Raen would know the Doman language!
A note on that... there's some information in the lore book, Encyclopaedia Eorzea, which states the majority of Raen already know a dialect variation on Eorzean, and therefore don't find it very difficult to adjust language-wise when they arrive in Eorzea.
Some people take this to mean that Doman is a dialect variation on Eorzean, but that's not canon stated fact. My belief based on all the evidence (including stuff from the geography section) is that "Doman" is an ancient language all of its own (with its own rules and writing script), but most Domans also know a "trade language" that is aforementioned dialect of Eorzean.
Communication between Othard (the continent Doma is on) and the rest of the world started about 20 years ago, thanks to the advent of airship travel (for 2000+ years before then, there was a huge mountain range in the way). So that's when people would've started learning this language; it's likely your character would've too. If he's young enough, he might even have grown up speaking it in addition to Doman.
And yeah, people use <brackets> to denote the use of a language other than Eorzean. Sometimes it means Doman, or sometimes it means other languages - like Xaelan/Steppes, Ala Mhigan, and so forth - so it can be good to check with the players what they're using it to mean today. [Square brackets] and {curly brackets} are workable alternatives if you end up needing to speak in 2+ "non-Eorzean" languages in a scene; just make sure everyone's on the same page to which is which!
For good measure, here's my write-up of all the lore I could find in the Encyclopaedia Eorzea on Doma, excluding information included in the section on Ninja or specific races.
I don't want this to be a scary wall of text so that's all I'll address for now; feel free to ask follow up questions and I, or someone else, will answer them for you!
A note on that... there's some information in the lore book, Encyclopaedia Eorzea, which states the majority of Raen already know a dialect variation on Eorzean, and therefore don't find it very difficult to adjust language-wise when they arrive in Eorzea.
Some people take this to mean that Doman is a dialect variation on Eorzean, but that's not canon stated fact. My belief based on all the evidence (including stuff from the geography section) is that "Doman" is an ancient language all of its own (with its own rules and writing script), but most Domans also know a "trade language" that is aforementioned dialect of Eorzean.
Communication between Othard (the continent Doma is on) and the rest of the world started about 20 years ago, thanks to the advent of airship travel (for 2000+ years before then, there was a huge mountain range in the way). So that's when people would've started learning this language; it's likely your character would've too. If he's young enough, he might even have grown up speaking it in addition to Doman.
And yeah, people use <brackets> to denote the use of a language other than Eorzean. Sometimes it means Doman, or sometimes it means other languages - like Xaelan/Steppes, Ala Mhigan, and so forth - so it can be good to check with the players what they're using it to mean today. [Square brackets] and {curly brackets} are workable alternatives if you end up needing to speak in 2+ "non-Eorzean" languages in a scene; just make sure everyone's on the same page to which is which!
For good measure, here's my write-up of all the lore I could find in the Encyclopaedia Eorzea on Doma, excluding information included in the section on Ninja or specific races.
I don't want this to be a scary wall of text so that's all I'll address for now; feel free to ask follow up questions and I, or someone else, will answer them for you!